Youxida, Hanahebi Student

Partner with Kyuubi, the Flame-Fox
Whenever Youxida, Hanahebi Student attacks,
you may have it become a copy of any
nonlegendary creature on the battlefield. Except
it's a legendary artifact creature and has vigilance.
{t}, Add two mana of any color. This mana
doesn't empty as steps and phases end.